@Sergio Wong Chung we have a setting (https://tinyurl.com/yrwdul9d) to let the vendor request for deactivation of their vendor profile(https://tinyurl.com/yn9gzer6). And after that if the admin accepts his request he can either make the products of that vendor as drafts or make those admin products(https://tinyurl.com/yvvq37fw). You can learn details of this flow from here https://multivendorx.com/docs/knowledgebase/vendor-account-deactivation-flow/.
So as per your requirement while deleting the vendors simply choose the option to make their products drafts.
Let us know if you need any further assistance from our end.
